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Youssef Guédira is the Paris cop who knows Maurice Leblanc's books by heart. While his colleagues laugh at his theory, he sees Arsène Lupin's signature in the robberies. Soufiane Guerrab plays him.
After the Louvre heist, Guédira is the only one who notices the jobs follow Leblanc's books, which he's been reading forever. His bosses don't take the idea seriously, so he digs in almost alone, matching pages, dates and disguises.
The trail leads him to Étretat, to a festival devoted to Lupin. In the middle of the crowd, Guédira calls the thief by the name he chose for himself: Lupin.
Guédira starts to see that the real criminal in this story may not be the thief. Alongside Captain Laugier he arrests Hubert Pellegrini, then watches the businessman's clout get him out soon after. The case stops being just a hunt for Assane.
Guédira doesn't buy Assane's death and won't let it go. To force the truth out, he leaks his evidence to a journalist. When the two finally meet, Assane offers a deal: he'll surrender if Guédira helps him save his family. Guédira agrees, and keeps his word.
In Leblanc's books, the cop forever chasing Lupin is Inspector Ganimard.
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